Utility of positron emission tomography-computed tomography scan in detecting residual hepatocellular carcinoma post treatment: Series of case reports

Figure 1 Case 1. A: Positron emission tomography scan: the white arrow shows the area of multiple foci of fludeoxyglucose uptake in the treated area; B: Multi-phase magnetic resonance imaging scan: it shows no arterial enhancement in the same area during the arterial phase; C: Positron emission tomography scan: the arrow indicates an area of fludeoxyglucose uptake, indicating another residual tumor.

Figure 2 Case 2. A: Multi-phase computed tomography scan: a hypodense area, indicated by the white arrow, in the liver during the arterial phase post trans-arterial chemo-embolization treatment; B: Positron emission tomography scan: in the same area, there is avid fludeoxyglucose uptake, indicating residual tumor.

Figure 3 Case 3. A: Positron emission tomography scan: the white arrow indicates a small focus of fludeoxyglucose uptake adjacent to the treatment zone showing absent metabolic activity; B: Multi-phase magnetic resonance imaging: the white arrow points to focal bleed at the periphery of the treatment zone post microwave ablation without evidence of any viable tumor during the arterial phase.

Figure 4 Case 4. Positron emission tomography scan: the white arrow points to the fludeoxyglucose uptake at the periphery of a treated lesion.